[qa] assert_start_raises_init_error #9832

pull NicolasDorier wants to merge 1 commits into bitcoin:master from NicolasDorier:assert_start_raises_init_error changing 2 files +29 −2
  1. NicolasDorier commented at 7:23 am on February 23, 2017: contributor

    assert_start_raises_init_error make it possible to test expected error condition when bitcoind is starting.

    ping @MarcoFalke and @jonasschnelli mentioned the need on #9662 and https://github.com/bitcoin/bitcoin/pull/9728

  2. NicolasDorier force-pushed on Feb 23, 2017
  3. NicolasDorier force-pushed on Feb 23, 2017
  4. laanwj added the label Tests on Feb 23, 2017
  6. jonasschnelli commented at 3:32 pm on March 3, 2017: contributor
    Thanks. utACK 5737be099f83dfb367a342c36f7f0ae5ea31bc29. This is also required for #9662.
  7. in qa/rpc-tests/test_framework/util.py: in 5737be099f outdated 
    338@@ -338,7 +339,10 @@ def start_node(i, dirname, extra_args=None, rpchost=None, timewait=None, binary=
339         binary = os.getenv("BITCOIND", "bitcoind")
340     args = [ binary, "-datadir="+datadir, "-server", "-keypool=1", "-discover=0", "-rest", "-mocktime="+str(get_mocktime()) ]
341     if extra_args is not None: args.extend(extra_args)
342-    bitcoind_processes[i] = subprocess.Popen(args)
343+    if stderr is not None:
    jnewbery commented at 8:22 pm on March 3, 2017:
    I don’t think this if/else construction is needed. subprocess.Popen’s stderr argument defaults to None, so you can just call bitcoind_processes[i] = subprocess.Popen(args, stderr=stderr)
  8. in qa/rpc-tests/test_framework/util.py: in 5737be099f outdated 
    364+        if expected_msg is None:
365+            assert_msg = "bitcoind should have exited with an error"
366+        else:
367+            assert_msg = "bitcoind should have exited with expected error " + expected_msg
368+        raise AssertionError(assert_msg)
369+    except AssertionError as e:
    jnewbery commented at 8:25 pm on March 3, 2017:

    yuck! raising an exception in expectation of catching it in the very next line.

    I think try/except/else is a much cleaner construction, as in:

    0try:
1    thing_we_expect_to_fail()
2except ExceptionType as e:
3    do_some_asserts_on_the_exception_raised()
4else:
5    # oops, we were expecting an exception
6    assert False, "we were expecting an exception!"
  9. in qa/rpc-tests/test_framework/util.py: in 5737be099f outdated 
    355@@ -352,6 +356,28 @@ def start_node(i, dirname, extra_args=None, rpchost=None, timewait=None, binary=
356 
357     return proxy
358 
359+def assert_start_raises_init_error(i, dirname, extra_args=None, expected_msg=None):
360+    log_stderr = tempfile.SpooledTemporaryFile(max_size=2**16)
    jnewbery commented at 8:29 pm on March 3, 2017:
    Consider opening the file using the with log_stderr as... form. That means the file will be closed automatically (even if an exception is raised on the way), and you won’t have to close it yourself with the finally branch at the bottom.
  10. in qa/rpc-tests/test_framework/util.py: in 5737be099f outdated 
    367+            assert_msg = "bitcoind should have exited with expected error " + expected_msg
368+        raise AssertionError(assert_msg)
369+    except AssertionError as e:
370+        raise
371+    except Exception as e:
372+        assert('bitcoind exited' in str(e)) #node must have shutdown
    jnewbery commented at 8:30 pm on March 3, 2017:

    minor nit: assert is a statement, not a function. This should be:

    assert ‘bitcoind exited’ in str(e)

  11. NicolasDorier force-pushed on Mar 5, 2017
  12. NicolasDorier force-pushed on Mar 5, 2017
  13. NicolasDorier commented at 4:51 pm on March 5, 2017: contributor
    nits of @jnewbery addressed
  14. MarcoFalke commented at 5:24 pm on March 5, 2017: member
    Please squash.
  15. NicolasDorier force-pushed on Mar 6, 2017
  16. [qa] assert_start_raises_init_error 025dec0e5b
  17. NicolasDorier force-pushed on Mar 6, 2017
  18. NicolasDorier commented at 8:22 am on March 6, 2017: contributor
    squashed @MarcoFalke
  19. laanwj merged this on Mar 6, 2017
  20. laanwj closed this on Mar 6, 2017
  21. laanwj referenced this in commit 48c3429c50 on Mar 6, 2017
  22. in qa/rpc-tests/test_framework/util.py: in 025dec0e5b 
    352@@ -352,6 +353,25 @@ def start_node(i, dirname, extra_args=None, rpchost=None, timewait=None, binary=
353 
354     return proxy
355 
356+def assert_start_raises_init_error(i, dirname, extra_args=None, expected_msg=None):
357+    with tempfile.SpooledTemporaryFile(max_size=2**16) as log_stderr:
358+        try:
359+            node = start_node(i, dirname, extra_args, stderr=log_stderr)
360+            stop_node(node, i)
    MarcoFalke commented at 9:44 am on March 6, 2017:
    Nit: No need to stop the node here. This is done by the test framework.
    NicolasDorier commented at 11:20 am on March 6, 2017:

    It does need to be stopped, or this function would not be side effect free.

    EDIT: Ah no it does not, as if it passes here, the test is finished, which would close the node anyway.

    MarcoFalke commented at 11:43 am on March 6, 2017:
    Right this line is only executed in exceptional circumstances, in which case the whole frameworks shuts down.
  23. MarcoFalke commented at 9:44 am on March 6, 2017: member
    Post merge utACK 025dec0e5bf001ba297f7430affe4098627ea5ce
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NicolasDorier laanwj jonasschnelli jnewbery MarcoFalke

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